Erratum: Cellular Association and Assembly of a Multistage Delivery System

DOI: 10.1002/smll.201000126 The captions of Figure 1 and 2 were printed incorrectly in Issue 12 of Small. The corrected figure captions are provided below: Figure 1. Cellular engulfment of S1MPs by J774A.1 macrophages. A) SEM images of J774A.1 cells incubated with S1MPs (at a ratio of 1:5) for different lengths of time, which demonstrate particle orientation during uptake and varying degrees of internalization (10k, 50k, 50k, 40k; bars: 2 mm). B) AFM amplitude and height images, including section analysis, which demonstrate the height and diameter of S1MPs. C) AFM image and section analysis of a J774A.1 cell following internalization of S1MPs (1:5 ratio). Figure 2. Discoidal S1MP loading with SPIONs. A) SEM images of S1MPs taken at increasing magnification (35k, 60k, 150k; bar: 1000, 500, 100 nm). B) TEM images of ultrathin sections of resin-embedded S1MPs taken at increasing magnification (30k, 40k, 100k; bar: 500, 500, 100 nm). C) TEM images of ultrathin sections of S1MPs loaded with SPIONs following surface modification of the S1MPs by either oxidation or oxidation and subsequent APTES (9%) modification (100k; bar: 100 nm). D) High-angle annular dark-field (HAADF)-STEM images showing the porous matrix of an oxidized S1MP loaded with SPIONs (bar: 200 nm (left), 50 nm (right)).